c# - Line element doesn't get properly focus when selected -

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i have .xaml file, looks like:

<resourcedictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"                     xmlns:lineelement="clr-namespace:...lineelement"                     xmlns:mvvmwpfbehavior="clr-namespace:gno.libraries.wpfmvvm.behaviors.focus;assembly=gno.libraries.wpfmvvm">      <datatemplate datatype="{x:type lineelement:lineelementviewmodel}">              <grid>                 <line stroke="darkblue"  x1="{binding px1}" y1="{binding py1}" x2="{binding px2}" y2="{binding py2}"                    strokethickness="3" visibility="visible" stretch="fill">                                         </line>              </grid>     </datatemplate> </resourcedictionary>

if have set coordinates in lineelementviewmodel.cs as: px1=0, py1=0, px2=150, py2=0, view:

enter image description here

with proper focus selection can see.

if change coordinates to: px1=0, py1=0, px2=0, py2=150, view:

enter image description here

which behaving want. can see focus selected appropriately.

the problem comes when resize or stretch (i able since use stretch="fill") line this:

enter image description here

when change x1, y1 etc. coordinates before make vertical, focus when select line element doesn't updated.

enter image description here


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