WPF Set border left and width -

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I have to set the border to the left and the width I am trying to use margin 

  b.Margin = new thickness (PBX, B. margin. Top, B. margin. Right, B. margin.bottom);   
 But if I set the width property, then the border is placed in a strange position ... (half screen + half to the left which I want).  
 How can I do the trick?  
 Thanks   
 
 
  var totalAvailableWidth = ...; // You have to get it somewhere Var Margin Right = Total Available Width - pb.X - Width; B Margin = new thickness (PBX, B. margin.Tap, margin right, B. margin.bottom);

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