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Custom control disappear from dessign. VS 2015 Update 3

I just update Visual Studio 2015 to 'Update 3' and notice a very (and annoying) behaviour:

I've a custom TextBox control. When you build the project that custom TextBox it shows on toolbox controls. All is OK.

I created a new Form and place some labels, button and my custom TextBox to that Form. All is OK.

BUT, sometimes (its not always) when I change Build from debug to release, build the project, and back to debug, VS shows me a LOT of errors like:

MyCTextBox1.Text invalid because MyCTextBox1 does not exits.

If you open the formx.dessigner.vb file, see that all the customs TextBoxes were removed. WTF 😑

I've never seen this behaviour before updating VS 2015 to Update 3, and the 'problem' is that only happens sometimes, not always.

Has anyone had the same problem? How did you fixed?


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