WPF GridSplitter strange behavior when Column Width="Auto" -

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i have pretty simple layout, look:

<grid>     <grid.columndefinitions>         <columndefinition width="*" minwidth="200"></columndefinition>         <columndefinition width="5"></columndefinition>         <columndefinition width="auto" minwidth="50"></columndefinition>     </grid.columndefinitions>     <border grid.column="0"             borderbrush="red"             borderthickness="2">         <!-- picture-->         <image source="/resources/previewtest.png"></image>     </border>     <gridsplitter grid.column="1"                      width="5"                     horizontalalignment="center"                     verticalalignment="stretch"                     resizebehavior="previousandnext"></gridsplitter>     <expander grid.column="2"                 expanddirection="left"                 borderbrush="royalblue"                 borderthickness="2">         <!-- picture-->         <image source="/resources/previewtest.png"></image>         </expander> </grid>

the problem: when i'm dragging gridsplitter left, right column goes out window border shown on animation. found happens when width of third column set "auto" (width="auto"). if set width="*" gridsplitter works fine , third column doesn't go out window border. why when width="auto" happens?

demonstration

your problem caused fact 1 of columndefinitions set auto. happening when first column reaches minwidth value, can't smaller. however, if keep moving gridslitter, right column has grow. seeing let grow size, current problem.

all need fix set right columndefinition.width property * value well. in way, can't grow out of grid more. if need to, can control end sizes of columns using columndefinition.maxwidth property. try this:

<grid>     <grid.columndefinitions>         <columndefinition width="*" minwidth="200" />         <columndefinition width="5" />         <columndefinition width="*" minwidth="50" />     </grid.columndefinitions>     <border grid.column="0" borderbrush="red" borderthickness="2">         <image source="/resources/previewtest.png" />     </border>     <gridsplitter grid.column="1" width="5" horizontalalignment="center" verticalalignment="stretch" resizebehavior="basedonalignment" />     <expander grid.column="2" expanddirection="left" borderbrush="royalblue" borderthickness="2">         <image source="/resources/previewtest.png" />     </expander> </grid>

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