WPF - Create buttons with up and down arrows using standard buttons

I want to create some up and down buttons using the standard button background but with black arrows.

What is the best way to accomplish this with WPF??

Malcolm

I find Marlett (a font built into Windows) handy for that sort of thing.

<Button FontFamily="Marlett" FontSize="20" Content="5"/>
<Button FontFamily="Marlett" FontSize="20" Content="6"/>

Output:

No discussion on this subject would be complete without mentioning the geometry mini-language (or Path Markup Syntax) for a more compact shape definition:-

  <Button>
    <Path Fill="Black" Data="M 0 6 L 12 6 L 6 0 Z"/>
  </Button>
  <Button>
    <Path Fill="Black" Data="M 0 0 L 6 6 L 12 0 Z"/>
  </Button>

The first describes a Move to 0,6 Line to 12,6 Line to 6,0 and then close the shape (Z).

There is also a curve syntax.

The preferred way to do this now is using Segoe UI Symbol. It replaces Marlett and provides many useful glyphs. Up and down would be

<Button FontFamily="Segoe UI Symbol" Content="&#xE1FD;"/>    
<Button FontFamily="Segoe UI Symbol" Content="&#xE110;"/>

Which renders as:

This font is pre-installed on all versions of windows 7+.

You can create a Polygon which represents your up and down triangles and then set them to be the content of the buttons:

<Button>
  <Polygon 
    Points="300,200 450,200 375,300 300,200"
    Stroke="Black">
    <Polygon.Fill>
      <SolidColorBrush Color="Black" />
    </Polygon.Fill>
  </Polygon>
</Button>

You can tweak these to draw different figured, but that's generally the XAML you would use for basic geometry.

If you would like to have an arrow with base rectangle you can use this sample...

<Button >
   <Polygon   Stretch="Fill"  Fill="Black" Points="0,0 0,30 0,10 30,10 30,-10 45,10 30,30 30,20 0,20 0,0 30,0 30,10 0,10" />
</Button>