WPF GridView column widths are set to prorated

<Grid>        <Grid>          <grid.columndefinitions>              <ColumnDefinitionWidth= "* *" />              <ColumnDefinitionWidth= "* *" />              <ColumnDefinitionWidth= "* *"/>              <ColumnDefinitionWidth= "1*"/>          </grid.columndefinitions>          <GridGrid.column= "0"x:name= "Col1"/>          <GridGrid.column= "1"x:name= "Col2"/>          <GridGrid.column= "2"x:name= "Col3"/>          <GridGrid.column= "3"x:name= "Col4"/>      </Grid>      <ListViewx:name= "ListView">          <Listview.view>              <GridView>                  <GridviewcolumnHeader= "Header1"Width= "{Binding elementname=col1,path=actualwidth}"/>                  <GridviewcolumnHeader= "Header2"Width= "{Binding elementname=col2,path=actualwidth}"/>                  <GridviewcolumnHeader= "Header3"Width= "{Binding elementname=col3,path=actualwidth}"/>                  <GridviewcolumnHeader= "Header4"Width= "{Binding elementname=col4,path=actualwidth}"/>              </GridView>          </Listview.view>      </ListView>  </Grid>  

WPF GridView column widths are set to prorated