I have 2 user control with exactly same xamgrid setting like:

 <XamGrid x:Name="mygrid"
    ItemsSource="{Binding DataList,Mode=TwoWay}"        
    CellClicked="mygrid_CellClicked"
    RowSelectorClicked="mygrid_RowSelectorClicked"                                                               
    CellDoubleClicked="mygrid_CellDoubleClicked">
....
 </XamGrid>

one is fine, but one is not working properly:

CellDoubleClicked not fired up at first double click on a row. Need to click on the row firstly, then double-click on the row again, then CellDoubleClicked will be fired.

Can't figure it out. Help please.