Someone

#include "rkg.h"

rkg_class_window (win_class)
	rkg_class_onInit (win_onInit)
	rkg_class_onQuit (win_onQuit)
rkg_class_end

rkg_result_t win_onInit (rkg_hWindow_t window, void* userData)
{
	rkg_hText_t text;
	
	text = rkg_createText (rkg_defaultTextClass, NULL);
	rkg_setText (text, "Hello, World!");
	rkg_addControl (window, text);

	return RKG_NO_ERROR;
}

rkg_result_t win_onQuit (rkg_hWindow_t window, void* userData)
{
	/* text is disposed of automagically by RKG */

	rkg_hModal_t mb;

	mb = rkg_createModal (rkg_modalOkayClass, NULL);
	rkg_setTitle (mb, "Thank you!");
	rkg_setText (mb, "Thank you for running my Hello World program");
	rkg_runModal (mb); 

	/* mb is disposed of automagically too */
}

int main (int argc, char** argv)
{
	rkg_hWindow_t window;

	/* Establish connection with a fitting RKG display */
	rkg_init(argc, argv);

	/* Create new instance of win_class */
	/* The second argument is a user-defined arg (void*) */
	window = rkg_createWindow (win_class, NULL);

	rkg_showWindow (window);

	return rkg_run();
}