How to detect that unbound column has changed and based on that enable or disable combo
How can I change the other datagrid column based on this, How to identify the row that was clicked and the fieldvalue?
A checkbox has 3 events, you would have to add a handler for all of them.
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Its checkbox in the xamgrid
Will it be the valuechanged event?
I guess that would depend on what your unbound column is. If your unbound column is just a free standing control, you could attach to the controls ValueChanged event (like a checkbox IsChecked event) and then toggle your secondary control.