Invalid WPF name? : <p>Can someone please explain to me why this name is invalid?</p>

<p>'stackPanelOneZeroZeroPercentBasicBuybackStartNormalBracketMotorplusEndNormalBracket StartNormalBracketOneEightZeroOneEndNormalBracketStartNormalBracketUnderwrittenEndNormalBracket' is not a valid value for property 'Name'.</p>
