Custom Highlight area for ToolStripDropDownButton

I would like to change the ToolStripDropDownButton and specifically the border, when the cursor is above the dropDownButton, these "blue" highlighted area.

How can I get the size of the image used by the toolStripDropDownButton and make this border/highlighted area as big as the image? The image is also a rectangle with rounded borders, is it possible to paint the border like this? I've made an small example image for what i want.

http://ift.tt/1GJW4XJ

Currently i have this but i have a problem with getting the location of the image. Currently i just wrote Point.Empty instead. Is it even possible to do it with a new renderer?

public MainForm()
{
    InitializeComponent();
    toolStrip1.Renderer = new MyRenderer();
}

private class MyRenderer : ToolStripProfessionalRenderer
{           
    protected override void OnRenderDropDownButtonBackground(ToolStripItemRenderEventArgs e)
    {
        Rectangle bounds = new Rectangle(Point.Empty, e.Item.Image.Size);
        e.Graphics.FillRectangle(Brushes.Aqua, bounds);
    }
}