Dmitry,

You'll need to unbind the control and provide your own logical binding. I typically stash this.ControlSource to a custom property, and then set ControlSource = "" in the Init() method, and then use the Refresh() and Valid() methods to provide the translations.

* untested code off the top of my head for illustration

* Init
this.cControlSource = this.ControlSource
this.ControlSource = ""

* Refresh
this.Value = ! eval( this.cControlSource)

* Valid
replace (this.cControlSource) with ! this.Value

>If I specify entry in ControlSource of a check box to
>

>!MyView.MyField
>

>
>I get "Control is ReadOnly" when clicking on this check box.
>
>Is there a way to use ! or Not in the ControlSource?