We are using a SharePoint Datetimecontrol that loads a file called iframe.aspx found under the _layouts folder, this page is using the SPDatePickerControl, this control has a property named OnClickScriptHandler that as described should be used if you want to use a custom JavaScript function when you select a date, but when using this property i get the following exception "Object reference not set to an instance of an object" when the control try to set this value in the property
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