Drop in a form a TadvcontrolDropdown and assign to its control property a control.
Then go to an other property and return to clear the control property of TadvcontrolDropdown in the Object Inspector: Bang!!!!
File AdvDropDown, Line 5620
Assigned(Fcontrol) should continue to cover DPI calculations and CsDesigning state
Thanks for your response. The following might be connected with this problem.
The dis-assigned control should also not being destroyed by the Tadvcontroldropdown?