diff --git a/include/gwin/button.h b/include/gwin/button.h
index a6b19333..73f42e37 100644
--- a/include/gwin/button.h
+++ b/include/gwin/button.h
@@ -84,7 +84,7 @@ extern "C" {
  *
  * @api
  */	
-GHandle gwinCreateButton(GButtonObject *gb, GWidgetInit *pInit);
+GHandle gwinCreateButton(GButtonObject *gb, const GWidgetInit *pInit);
 
 /**
  * @brief   Set the colors of a button.
diff --git a/include/gwin/checkbox.h b/include/gwin/checkbox.h
index 9a19a2e1..2823007a 100644
--- a/include/gwin/checkbox.h
+++ b/include/gwin/checkbox.h
@@ -73,7 +73,7 @@ typedef struct GCheckboxObject_t {
  *
  * @api
  */
-GHandle gwinCreateCheckbox(GCheckboxObject *gb, GWidgetInit *pInit);
+GHandle gwinCreateCheckbox(GCheckboxObject *gb, const GWidgetInit *pInit);
 
 /**
  * @brief	Get the state of a checkbox
diff --git a/include/gwin/class_gwin.h b/include/gwin/class_gwin.h
index c3d2ee36..dbda3619 100644
--- a/include/gwin/class_gwin.h
+++ b/include/gwin/class_gwin.h
@@ -117,7 +117,7 @@ typedef struct gwinVMT {
 	typedef struct gwmVMT {
 		void (*Init)		(void);									// @< The window manager has just been set as the current window manager
 		void (*DeInit)		(void);									// @< The window manager has just been removed as the current window manager
-		bool_t (*Add)		(GHandle gh, GWindowInit *pInit);		// @< A window has been added
+		bool_t (*Add)		(GHandle gh, const GWindowInit *pInit);	// @< A window has been added
 		void (*Delete)		(GHandle gh);							// @< A window has been deleted
 		void (*Visible)		(GHandle gh);							// @< A window has changed its visibility state
 		void (*Redim)		(GHandle gh, coord_t x, coord_t y, coord_t w, coord_t h);	// @< A window wants to be moved or resized
@@ -146,21 +146,19 @@ extern "C" {
  *
  * @notapi
  */
-GHandle _gwindowCreate(GWindowObject *pgw, GWindowInit *pInit, const gwinVMT *vmt, uint16_t flags);
+GHandle _gwindowCreate(GWindowObject *pgw, const GWindowInit *pInit, const gwinVMT *vmt, uint16_t flags);
 
 #if GWIN_NEED_WIDGET || defined(__DOXYGEN__)
 	/**
 	 * @brief	Initialise (and allocate if necessary) the base Widget object
 	 *
 	 * @param[in]	pgw		The GWidgetObject structure. If NULL one is allocated from the heap
-	 * @param[in]	x, y	The top left corner of the Widget relative to the screen
-	 * @param[in]	w, h	The width and height of the Widget window
-	 * @param[in]	size	The size of the Widget object to allocate
+	 * @param[in]	pInit	The user initialization parameters
 	 * @param[in]	vmt		The virtual method table for the Widget object
 	 *
 	 * @notapi
 	 */
-	GHandle _gwidgetCreate(GWidgetObject *pgw, GWidgetInit *pInit, const gwidgetVMT *vmt);
+	GHandle _gwidgetCreate(GWidgetObject *pgw, const GWidgetInit *pInit, const gwidgetVMT *vmt);
 
 	/**
 	 * @brief	Destroy the Widget object
diff --git a/include/gwin/console.h b/include/gwin/console.h
index 38c88f63..a3b3697c 100644
--- a/include/gwin/console.h
+++ b/include/gwin/console.h
@@ -64,7 +64,7 @@ extern "C" {
  *
  * @api
  */
-GHandle gwinCreateConsole(GConsoleObject *gc, GWindowInit *pInit);
+GHandle gwinCreateConsole(GConsoleObject *gc, const GWindowInit *pInit);
 
 #if GFX_USE_OS_CHIBIOS && GWIN_CONSOLE_USE_BASESTREAM
 	/**
diff --git a/include/gwin/graph.h b/include/gwin/graph.h
index 5e6abee1..b5fc1405 100644
--- a/include/gwin/graph.h
+++ b/include/gwin/graph.h
@@ -107,7 +107,7 @@ extern "C" {
  *
  * @api
  */
-GHandle gwinCreateGraph(GGraphObject *gg, GWindowInit *pInit);
+GHandle gwinCreateGraph(GGraphObject *gg, const GWindowInit *pInit);
 
 /**
  * @brief   Set the style of the graphing operations.
diff --git a/include/gwin/gwidget.h b/include/gwin/gwidget.h
index 50f19193..817f2b0d 100644
--- a/include/gwin/gwidget.h
+++ b/include/gwin/gwidget.h
@@ -23,7 +23,7 @@
  * 				via an input device such as a mouse or toggle buttons. It is the
  * 				base class for widgets such as buttons and sliders.
  *
- * @pre		GFX_USE_GWIN must be set to TRUE in your gfxconf.h
+ * @pre		GFX_USE_GWIN and GWIN_NEED_WIDGET must be set to TRUE in your gfxconf.h
  * @{
  */
 
@@ -40,7 +40,7 @@ typedef void (*CustomWidgetDrawFunction)(struct GWidgetObject *gw, void *param);
  * @note	A widget is a GWIN window that accepts user input.
  * 			It also has a number of other properties such as its ability
  * 			to redraw itself (a widget maintains drawing state).
- * @note	Do you access the members directly. Treat it as a black-box and use the method functions.
+ * @note	Do not access the members directly. Treat it as a black-box and use the method functions.
  *
  * @{
  */
diff --git a/include/gwin/gwin.h b/include/gwin/gwin.h
index 2a03c125..3f620206 100644
--- a/include/gwin/gwin.h
+++ b/include/gwin/gwin.h
@@ -154,7 +154,7 @@ extern "C" {
 	 *
 	 * @api
 	 */
-	GHandle gwinCreateWindow(GWindowObject *pgw, GWindowInit *pInit);
+	GHandle gwinCreateWindow(GWindowObject *pgw, const GWindowInit *pInit);
 
 	/**
 	 * @brief   Destroy a window (of any type). Releases any dynamically allocated memory.
diff --git a/include/gwin/slider.h b/include/gwin/slider.h
index 4479950f..57bd5a72 100644
--- a/include/gwin/slider.h
+++ b/include/gwin/slider.h
@@ -82,7 +82,7 @@ extern "C" {
  *
  * @api
  */	
-GHandle gwinCreateSlider(GSliderObject *gb, GWidgetInit *pInit);
+GHandle gwinCreateSlider(GSliderObject *gb, const GWidgetInit *pInit);
 
 /**
  * @brief   Set the slider range.
diff --git a/src/gwin/button.c b/src/gwin/button.c
index 4f823aa6..303d1078 100644
--- a/src/gwin/button.c
+++ b/src/gwin/button.c
@@ -151,7 +151,7 @@ static uint16_t ToggleGet(GWidgetObject *gw, uint16_t role) {
 	return ((GButtonObject *)gw)->toggle;
 }
 
-GHandle gwinCreateButton(GButtonObject *gw, GWidgetInit *pInit) {
+GHandle gwinCreateButton(GButtonObject *gw, const GWidgetInit *pInit) {
 	if (!(gw = (GButtonObject *)_gwidgetCreate(&gw->w, pInit, &buttonVMT)))
 		return 0;
 
diff --git a/src/gwin/checkbox.c b/src/gwin/checkbox.c
index b4628ae0..62f4c55b 100644
--- a/src/gwin/checkbox.c
+++ b/src/gwin/checkbox.c
@@ -113,7 +113,7 @@ static uint16_t ToggleGet(GWidgetObject *gw, uint16_t role) {
 	return ((GCheckboxObject *)gw)->toggle;
 }
 
-GHandle gwinCreateCheckbox(GCheckboxObject *gb, GWidgetInit *pInit) {
+GHandle gwinCreateCheckbox(GCheckboxObject *gb, const GWidgetInit *pInit) {
 	if (!(gb = (GCheckboxObject *)_gwidgetCreate(&gb->w, pInit, &checkboxVMT)))
 		return 0;
 
diff --git a/src/gwin/console.c b/src/gwin/console.c
index 39e534b4..105cc79d 100644
--- a/src/gwin/console.c
+++ b/src/gwin/console.c
@@ -66,7 +66,7 @@ static const gwinVMT consoleVMT = {
 		AfterClear,				// The after-clear routine
 };
 
-GHandle gwinCreateConsole(GConsoleObject *gc, GWindowInit *pInit) {
+GHandle gwinCreateConsole(GConsoleObject *gc, const GWindowInit *pInit) {
 	if (!(gc = (GConsoleObject *)_gwindowCreate(&gc->g, pInit, &consoleVMT, 0)))
 		return 0;
 	#if GFX_USE_OS_CHIBIOS && GWIN_CONSOLE_USE_BASESTREAM
diff --git a/src/gwin/graph.c b/src/gwin/graph.c
index 81ce1b5f..049f52e0 100644
--- a/src/gwin/graph.c
+++ b/src/gwin/graph.c
@@ -165,7 +165,7 @@ static void lineto(GGraphObject *gg, coord_t x0, coord_t y0, coord_t x1, coord_t
 	}
 }
 
-GHandle gwinCreateGraph(GGraphObject *gg, GWindowInit *pInit) {
+GHandle gwinCreateGraph(GGraphObject *gg, const GWindowInit *pInit) {
 	if (!(gg = (GGraphObject *)_gwindowCreate(&gg->g, pInit, &graphVMT, 0)))
 		return 0;
 	gg->xorigin = gg->yorigin = 0;
diff --git a/src/gwin/gwidget.c b/src/gwin/gwidget.c
index 2825bf4c..a2b82f1d 100644
--- a/src/gwin/gwidget.c
+++ b/src/gwin/gwidget.c
@@ -165,7 +165,7 @@ void _gwidgetInit(void) {
 	geventRegisterCallback(&gl, gwidgetEvent, 0);
 }
 
-GHandle _gwidgetCreate(GWidgetObject *pgw, GWidgetInit *pInit, const gwidgetVMT *vmt) {
+GHandle _gwidgetCreate(GWidgetObject *pgw, const GWidgetInit *pInit, const gwidgetVMT *vmt) {
 	if (!(pgw = (GWidgetObject *)_gwindowCreate(&pgw->g, &pInit->g, &vmt->g, GWIN_FLG_WIDGET|GWIN_FLG_ENABLED)))
 		return 0;
 
diff --git a/src/gwin/gwin.c b/src/gwin/gwin.c
index 110d35cc..c1122b3f 100644
--- a/src/gwin/gwin.c
+++ b/src/gwin/gwin.c
@@ -52,7 +52,7 @@ static color_t	defaultBgColor = Black;
 		} else
 			gwinClear(gh);
 	}
-	static void _gwm_redim(GHandle gh, GWindowInit *pInit) {
+	static void _gwm_redim(GHandle gh, const GWindowInit *pInit) {
 		gh->x = pInit->x; gh->y = pInit->y;
 		gh->width = pInit->width; gh->height = pInit->height;
 		if (gh->x < 0) { gh->width += gh->x; gh->x = 0; }
@@ -85,7 +85,7 @@ void _gwinInit(void) {
 
 // Internal routine for use by GWIN components only
 // Initialise a window creating it dynamically if required.
-GHandle _gwindowCreate(GWindowObject *pgw, GWindowInit *pInit, const gwinVMT *vmt, uint16_t flags) {
+GHandle _gwindowCreate(GWindowObject *pgw, const GWindowInit *pInit, const gwinVMT *vmt, uint16_t flags) {
 	// Allocate the structure if necessary
 	if (!pgw) {
 		if (!(pgw = (GWindowObject *)gfxAlloc(vmt->size)))
@@ -149,7 +149,7 @@ void gwinSetDefaultBgColor(color_t bgclr) {
  * The GWindow Routines
  *-----------------------------------------------*/
 
-GHandle gwinCreateWindow(GWindowObject *pgw, GWindowInit *pInit) {
+GHandle gwinCreateWindow(GWindowObject *pgw, const GWindowInit *pInit) {
 	if (!(pgw = _gwindowCreate(pgw, pInit, &basegwinVMT, 0)))
 		return 0;
 	gwinSetVisible(pgw, pInit->show);
diff --git a/src/gwin/slider.c b/src/gwin/slider.c
index 08dd6ca7..2dfa3a7c 100644
--- a/src/gwin/slider.c
+++ b/src/gwin/slider.c
@@ -233,7 +233,7 @@ static uint16_t DialGet(GWidgetObject *gw, uint16_t role) {
 	return ((GSliderObject *)gw)->dial;
 }
 
-GHandle gwinCreateSlider(GSliderObject *gs, GWidgetInit *pInit) {
+GHandle gwinCreateSlider(GSliderObject *gs, const GWidgetInit *pInit) {
 	if (!(gs = (GSliderObject *)_gwidgetCreate(&gs->w, pInit, &sliderVMT)))
 		return 0;
 	gs->t_dn = (uint16_t) -1;