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Because of the space in the middle (after EndNormalBracket)
stackPanelOneZeroZeroPercentBasicBuybackStartNormalBracketMotorplusEndNormalBracket StartNormalBracketOneEightZeroOneEndNormalBracketStartNormalBracketUnderwrittenEndNormalBracket
here ^
Other than that, there is (technically) nothing wrong with it.
3
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solved Invalid WPF name? [closed]