If I have a UserControl (UsrCtlDate) which contains a textbox (txtDate_D), how do I call a procedure which lies in the active form when the event "txtDate_D.validating" is fired?

I tried "Form.ActiveForm.Procedure1" which doesn't work. I also tried declaring a string which contains the name of the current active form, and then using If statements with specific Form names (e.g. If CurrentForm = "frmData" then frmData.Procedure1), which also didn't work. Lastly, I tried UserControl.Parent.Procedure1, which also failed.

How can I call a procedure which lies in the active form from the UserControl?