Need some help with wpf :?

the program is not mine, found on the Internet, wanted to see her better, but the mainwindow is not shown

error: color picker doesn't exist in the namespace schemas.xceed.com/wpf/xaml/toolkit
<grid grid.row="0">
<xctk:colorpicker x:name="colorBorderPicker" horizontalalignment="Center" width="40" margin="33,0,33.4,10" height="22" verticalalignment="Bottom" selectedcolorchanged="colorBorderPicker_SelectedColorChanged">
</xctk:colorpicker></grid>
July 8th 19 at 15:45
3 answers
July 8th 19 at 15:47
xmlns:toolkit ="schemas.xceed.com/wpf/xaml/toolkit" - written like. check it out of the library in the references
It is easiest to install through the package Manager Console command - Install-Package WPFToolkit
https://www.nuget.org/packages/WPFToolkit/
July 8th 19 at 15:49
Libraries missing, or not connected in the project references, correct, or if there is this Xceed rarely used, you can just "throw" from everywhere, and starts.
July 8th 19 at 15:51
Not enough namespace declarations xctk.
Should be about this line:
<window... xmlns:xctk="http://schemas.microsoft.com/expression/blend/2008" ..></window...>
xmlns:xctk="schemas.xceed.com/wpf/xaml/toolkit"
there is - Dandre.Schroeder commented on July 8th 19 at 15:54
: perhaps lacking some Assembly references. - athena9 commented on July 8th 19 at 15:57

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