I just read something about this, will see if it works, thx! /does exactly the same as a normal grid.. Example of what im doing: <grid> <expander content="{Staticresource somecontent}" /> <Expander content="{Staticresource somecontent2}" /> <Expander content="{Staticresource somecontent3}" /> <Expander content="{Staticresource somecontent4}"/> </grid> The resource content is something like this: ... Each expander resizes now to the amount of content (images) in them, which is different for each 1.. Found a solution: <Grid.ColumnDefinitions> <ColumnDefinition Width="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Grid}, AncestorLevel=2}, Path=ColumnDefinitions[0].Width}" /> <ColumnDefinition Width="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Grid}, AncestorLevel=2}, Path=ColumnDefinitions[1].Width}"/> <ColumnDefinition Width="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Grid}, AncestorLevel=2}, Path=ColumnDefinitions[2].Width}"/> <ColumnDefinition Width="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Grid}, AncestorLevel=2}, Path=ColumnDefinitions[3].Width}"/> </Grid.ColumnDefinitions> modified on Friday, April 11, 2008 3:48 AM