Hi
2 solutions to change the olecontrol possibility to be enabled/disabled:

1.add just a commandbutton on the form to switch between 2 states:enabled/disabled

*in click event
with thisform.olecontrol1.object
.enabled=!.enabled
endwith

the key is "object" otherwise cannot change the dtPicker state.

2.can be also a checkbox with this code

*in interactiveChange() event
thisform.olecontrol1.object.enabled=iif(this.value=1,.t.,.f.)

the visual indication of a disabled control is that it is grayed and dont react to events (user or by code).