c# - Bind Grid width to ParentGrid.Width - ParentGridBorder.BorderThickness -

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i started wpf, please bear me on simple mistakes.

as title states, want bind grid's width innerwidth of parentgrid. code example (very stripped down):

<grid name="parentgrid" width="300">     <border name="parentgridborder thickness="2" width="{binding width, elementname=parentgrid}" />     <grid name="childgrid" width="{**? parentwidth - parentborderthickness ?**}">         ....     </grid> </grid>

i'm using visual studio 2012, wpf, , c# code-behind (i assume pretty standard setup). appreciated.

addendum: poor , misguided approach due newbishness towards wpf. selected answer pointed out sizing issues trying create workarounds for.

i recommend ignore grid.border idea , instead add margin second grid. unless require border other reason, way go.

<grid name="parentgrid" width="300">     <grid name="childgrid" margin="10">     ....     </grid> </grid>

objects inside grids naturally fit parent's size unless explicitly stated otherwise.

note child grid maintains size

note child grid maintains size


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