How to stretch the image of (1* 66 ) pixel

In a WPF Application using XAML,

I have 2 images, which needs to be oriented horizontally. One is of width 784 * 66 and other is 1 * 66.

while, design time, since my window is auto it shows properly, but during runtime, the window is of 1280 width... so, the image 1 * 66 should stretch and cover the rest (1280 - (784 + 1))

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should become

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which means , my firstimage should have the same width (784) and the second image should stretch to cover the rest even though its only one pixel.

Please help me

 <Grid HorizontalAlignment="Left" Height="66" Name="grdTopImages"> <Grid.ColumnDefinitions> <ColumnDefinition Width="*" /> <ColumnDefinition Width="Auto" MinWidth="1" /> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition Height="66" /> </Grid.RowDefinitions> <Image Name="imgClientPhoto" Grid.Column="0" Grid.Row="0" Source="/Honeywell.eHTMP;component/Resources/_left.gif"></Image> <Image Name="imgExtraImg" Grid.Column="1" Grid.Row="0" Stretch="Fill" Source="/Honeywell.eHTMP;component/Resources/_right.gif"></Image> </Grid> 

Thanks Ramm