How to disable fast slider movement

Follow the code below:

<Slider Name="sliProgress" 
        Thumb.DragStarted="sliProgress_DragStarted" 
        Thumb.DragCompleted="sliProgress_DragCompleted" 
        ValueChanged="sliProgress_ValueChanged" />

When you hold mouse click on the slider bar, it starts to move faster until you reach the pointer, this I do not want, how can I disable it? You can only move on the "button".

I want to change the position only in the "button".

See the image below:

Youcanseethatthepointerisholdingthe"button" to move forward or back.