test drag & drop

TestApp1/TestApp1.cpp

 	void OnInitialize(void) override
 	{
 		DKLog("%s", DKGL_FUNCTION_NAME);
-		window = DKWindow::Create("DefaultWindow", DKWindow::StyleGenericWindow, this->EventLoop());
+		DKWindow::WindowCallback cb = {};
+
+		cb.filesDropped = DKFunction([](DKWindow*, const DKPoint&, const DKWindow::WindowCallback::StringArray&) {
+			DKLog("cb.filesDropped");
+		});
+
+		window = DKWindow::Create("DefaultWindow", 
+								  DKWindow::StyleGenericWindow|DKWindow::StyleAcceptFileDrop,
+								  this->EventLoop(),
+								  cb);
 		window->Activate();
 
 		window->AddEventHandler(this,