Datagrid will present differently in different computers if you give a fixed size. you need to use something like this
<window xmlns:ctrl="clr-namespace:Itenso.Windows.Controls.ListViewLayout;assembly=Itenso.Windows.Controls.ListViewLayout">
<gridview>
<gridview.columns>
<gridviewcolumn ctrl:rangecolumn.minwidth="50" width="50" ctrl:rangecolumn.maxwidth="50">
</gridviewcolumn>
</gridview.columns>
</gridview>
</window>