Height of RowDefinition in Grid is vary from IE 6 browser to other browser in silverlight

Question

I have a sample control in silverlight application.

<Grid.RowDefinitions>
   <RowDefinition Height="Auto"/>
   <RowDefinition Height="10"/>
   <RowDefinition Height="50"/>
   <RowDefinition Height="15" />
   <RowDefinition Height="Auto"/>
   <RowDefinition Height="Auto"/>

Here the height of 3 & 4 rows vary in IE 6 and other browsers.

Any idea how can i fix this? Your help will be much appreciated.

Thanks & Regards, Keyur