NumericUpDownLib
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Implements numeric up down WPF controls to edit/display values (byte, integer, short, ushort etc.) with a textbox and optional up/down arrow (repeat) buttons. Value editing is possible by dragging th...
do not adjust the control panel length when use mouse to drap the control of displayLength
Water Mark
fix #40
now we have to use `ValueChanged="UIntegerUpDown_ValueChanged"` can we use binding Command for this event?
System.Windows.Data Error: 5 : Value produced by BindingExpression is not valid for target property. Double:'NaN' BindingExpression:Path=Width; DataItem='TextBox' (Name='PART_Measuring_Element'); target element is 'TextBox' (Name=''); target property is 'MaxWidth' (type 'Double')
When the user enters in their own number, if it is invalid, the property changed event does not fire nor does the lost focus event if that is used instead....
fix: #66 before and after:  default is also ok 
min = 7 when value = 7 
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make mothed protect for sub-class