How can I create a greyed-out setting in custom DrawingTool properties window?
For example I want to display the Add-On Version so it will be visible but won't be editable by the user.
I tried declaring [ReadOnly(true)], [Browsable(false)] and combined options as well, but it seems it only removes the property from the properties window.
[DefaultValue(5.2)]
[Display(Name = "Add-On Version", Order = 1, GroupName = "General")]
public double AddOnVersion { get; set; }

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