bool HandleActivate(int state, bool minimized, WXHWND activate);
bool HandleCommand(WXWORD id, WXWORD cmd, WXHWND control);
// override window proc for MDI-specific message processing
bool HandleActivate(int state, bool minimized, WXHWND activate);
bool HandleCommand(WXWORD id, WXWORD cmd, WXHWND control);
// override window proc for MDI-specific message processing