fixes of transient popup dialogs, still not perfect, but getting there:

* fixed: popup didn't work when editor didn't have focus
* fixed: dimissal by losing focus didn't repaint dropdown arrows

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@1572 0fc631ac-6414-0410-93d0-97cfa31319b6

src/gui/drop_down_list.hpp

@@ -45,7 +45,7 @@ class DropDownList : public wxPopupTransientWindow {
 	/// Prepare for showing the list
 	virtual void onShow() {}
 	/// Do something after hiding the list
-	virtual void onHide() {}
+	virtual void OnDismiss();
 	
 	inline bool isRoot() { return parent_menu == nullptr; }