Denis,

No, you can't extend the property sheet to include your custom properties. You can use your own builder to accomplish this. In addition to Trey pointing you to Ken's site there are some simple builder examples on my website. Instead of .prgs they could be forms that had comboboxes like you want.

>I think,I not correctly have formulated the question. I want to make that values of properties of the user defined class in the "Properties"(Form Designer) window represented as combobox with defined values.
>For an example as standard property for a Form object "BorderStyle"
>0 - No border
>1 - Fixed single etc.