When Widgets Collide

I have a (new/edit) form that has the Attribute Radiobutton List and the Format String Widgets. When I call the form from a New-button on a Datagrid it pops as expected When I go through a MF that creates the Object and pre-sets some variables it wont work and I get this message Unable to render mxuiwidgetMxFormView_2 widget: Cannot call method 'getEntity' of undefined Suggestions?
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