If i have a DHCtrl and want to use it in TabCtrl for exact child position where "slaveCtrl" usually is,
how do i get that position? for regular Ctrl you just call TabCtrl.Set(...), but here it's a little different.
When DHCtrl is assigned to TabCtrl.Set(...) it becomes child of a main TopWindow, so a little hokus pokus must be used to set position of DHCtrl correctly