Trapping Form Events

its possibly because your event is related to the form rather than the textbox,

I had a similar problem a while back, and in the end decided that what i actually wanted was the event to trigger after the textbox entry had been completed and the user had moved onto the next textbox, so i put my event here

Private Sub TextBox1_Exit(ByVal Cancel As MSForms.ReturnBoolean)

and my event fired at the correct time and did what i wanted (i needed to check the data entered did not already exist on the worksheet being accessed by the textbox)

let me know if this helps