thank you for the explanation !

exaclty what i need, it work like a charm

Hi,

The problem with your code is that when you use the ComposeTextStyle method for a shape that does not have a shape style, then you get a reference to the document text style. You then modify this reference and that is why the text style of all shapes that do not have a local text style specified changes. You should clone the composed text style to avoid this. The following is a code example:

// Loop through all selected shapes
NNodeList nodes = view.Selection.Nodes;
for (int i = 0; i < nodes.Count; i++)
{
    NShape shape = nodes[i] as NShape;
    if (shape == null)
        continue;

    // Get or compose shape's text style
    NTextStyle textStyle;
    if (shape.Style != null && shape.Style.TextStyle != null)
    {
        // The shape has text style, so use it
        textStyle = shape.Style.TextStyle;
    }
    else
    {
        // The shape does not have text style, so compose it and clone it
        textStyle = (NTextStyle)shape.ComposeTextStyle().Clone();
    }

    // Create and set backplane style
    NBackplaneStyle backplaneStyle = new NBackplaneStyle();
    backplaneStyle.Visible = true;
    backplaneStyle.FillStyle = new NColorFillStyle(Color.Yellow);
    textStyle.BackplaneStyle = backplaneStyle;

    // Set shape text style
    NStyle.SetTextStyle(shape, textStyle);
}

Best Regards,
Nevron Support Team

Hi, 
i cant figure out how i can do it with a button. I can change almost everything but the backplanestyle seems to change on all shapes.

here's the code i got

foreach (NShape shape in nDrawingView1.Selection.Nodes)
    {  
      if (shape.Style == null && shape.Style.StrokeStyle == null)
      {       
      }
      else
      {
       shape.Text = "A";
       shape.Style.EndArrowheadStyle = new NArrowheadStyle(ArrowheadShape.Arrow, "", new NSizeL(5, 5), new NColorFillStyle(Color.Gray), new NStrokeStyle(1, Color.Black));
       shape.Style.StartArrowheadStyle = new NArrowheadStyle(ArrowheadShape.Arrow, "", new NSizeL(5, 5), new NColorFillStyle(Color.Gray), new NStrokeStyle(1, Color.Black));
       shape.Style.FillStyle = new NColorFillStyle(Color.Transparent);
       NTextStyle textStyle = new NTextStyle();
 
       if (shape.Style != null && shape.Style.TextStyle != null)
       {
        textStyle = shape.Style.TextStyle;
       }
       else
       {
        textStyle = shape.ComposeTextStyle();
        NStyle.SetTextStyle(shape, textStyle);
       }
       textStyle.FontStyle = new NFontStyle("Verdana", 10, FontStyle.Regular | FontStyle.Regular);
       textStyle.FillStyle = new NColorFillStyle(Color.Black);
       textStyle.BackplaneStyle.Visible = true;
       textStyle.BackplaneStyle.StandardFrameStyle.Visible = false;
      }
    }

i tried with this  but it's not working
shape.Style.TextStyle.BackplaneStyle.Visible = true;
shape.Style.TextStyle.BackplaneStyle.StandardFrameStyle.Visible = false;

Can someone give me a hint on this please ?