Thank you for writing.
We are using a similar user control in the Watermark dialog used by our printing engine. This control is not displayed in the toolbox, but you can inherit it and change its ToolboxItem
attribute: Additionally, you can may want to change its minimum, maximum and format string as they are set internally to suit the needs of the Watermark dialog:
CustomPlusMinusEditor : PlusMinusEditor
.MaxValue = 100;
.MinValue = -100;
I hope this will help. Let me know if you need further assistance.
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