Question : Access Form for Date Entry

Goal:  Have the user select either TestDate or CommissionedDate from a combobox and then enter in a date into a text box.  Then onclick event of the IDTag in the SubForm populate the selected field with the entered date.

Situation:

Unbound Main Form with two controls:
Unbound Combo Box: cmbFieldName
Unbound Text Box : TestDate

Subform in datasheet view from table "Main-Master" displaying fields:
IDTag
Status
TestDate
CommissionedDate

In the OnClick Event of IDTag I have the following Code:

Me(Me.Parent.cmbFieldName) = Me.Parent.TestDate

Problem:
If I select TestDate from the combo box and enter in a date.  Immediately upon clicking IDTag, the field TestDate is populated with Date from the TextBox. (This is what I want to happen)  However,  When I select CommissionedDate from the combo box.  Immediately upon clicking IDTag nothing happens.  BUT, when I change records on the subform or just click back on the main form again, the field gets updated.

Why do I have to change records for the field to get updated but only for one field and not both?  I have several other forms throughout the database where I use this technique and it works fine. It is just this one form and the one field.

Please help... Thanks.

Answer : Access Form for Date Entry

Try this:

Me.Controls(Me.Parent.cmbFieldName) = Me.Parent.TestDate