add initial examples, replacing the 'Demos/Demos3'. Will make it work cross-platform, OpenGL3/OpenGL2 and add more examples to it.

examples/ThirdPartyLibs/Gwen/Controls/Dialogs/FileOpen.h

@@ -0,0 +1,35 @@
+#pragma once
+#ifndef GWEN_CONTROLS_DIALOGS_FILEOPEN_H
+#define GWEN_CONTROLS_DIALOGS_FILEOPEN_H
+
+#include "Gwen/Gwen.h"
+
+namespace Gwen 
+{
+	namespace Dialogs
+	{
+		// Usage:
+		//
+		// Gwen::Dialogs::FileOpen( true, "Open Map", "C:\my\folder\", "My Map Format|*.bmf", this, &MyClass::OpenFilename );
+		//
+
+		//
+		// The REAL function.
+		// If bUseSystem is used, it may use the system's modal dialog - which
+		// will steal focus and pause the rest of GWEN until it's continued.
+		//
+		void GWEN_EXPORT FileOpenEx( bool bUseSystem, const String& Name, const String& StartPath, const String& Extension, Gwen::Event::Handler* pHandler = NULL, Gwen::Event::Handler::FunctionStr fnCallback = NULL );
+
+		//
+		// Templated function simply to avoid having to manually cast the callback function.
+		//
+		template< typename A>
+		void FileOpen( bool bUseSystem, const String& Name, const String& StartPath, const String& Extension, Gwen::Event::Handler* pHandler = NULL, A fnCallback = NULL )
+		{
+			FileOpenEx( bUseSystem, Name, StartPath, Extension, pHandler, (Gwen::Event::Handler::FunctionStr)fnCallback );
+		}
+
+		
+	}
+}
+#endif