Note: this is a fairly advanced tutorial that assumes you’ve already done some basic programming in C#. In our TerraViz tool, we have a number of dropdown menus. There’s a bit of code that allows you to pass in a list of strings, and those become the items of the dropdown menu. The code we already had worked great, but then we wanted to have a dropdown that would show images instead of text. We could have just created one dropdown that shows text and one that shows images, but duplicating code is always...
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