create drag-deop binable property for my control

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controls

Binding

I created a custom control with a bindable property, but the WinForm designer won't allow me to drag and drop the datasource item onto my control and bind to it. It just creates a new control for it.
I can set the properties manually.
I can even set up my control as the control to use when you drag and drop the item onto the form.
But if I already have the control on the form I can't get the designer to bind to it by dragging and dropping the datasource item onto my control.
I am guessing that this is some kind of attribute setting but I have no Idea what it is.

Does anyone know hoe to do this?

Thanks in Advance