c# - Item enabled on form load even though it's IsEnabled is bound to a presumably false value -

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i expect lastnumberweeks numericupdown disabled on form load isn't. once switch radio selection , forth works properly, not on first load. outside of explicitly setting value in code behind can (i don't want have use code behind because of 1 case).

<radiobutton groupname="dayrangegroup" content="last number of usable occurences:"  name="lastusableoccurancesradiobutton" ischecked="true" />            <wincontrols:numericupdown x:name="lastusableoccurances" isenabled="{binding elementname=lastusableoccurancesradiobutton, path=ischecked}"   />       <radiobutton groupname="dayrangegroup"content="last number of weeks:"  name="lastnumberofweeksradiobutton"  />           <wincontrols:numericupdown x:name="lastnumberweeks" isenabled="{binding elementname=lastnumberofweeksradiobutton, path=ischecked}" />

i tested xaml textbox instead of wincontrols:numericupdown , working expected on load, it's not problem xaml. try setting updatesourcetrigger propertychanged see if might help. can try using view model bind instead of binding element.


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