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Editorial Team
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Asked: 2026-06-17T12:38:27+00:00

I have a problem with the visualization of a Columnheader when I add a

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I have a problem with the visualization of a Columnheader when I add a second relationship to the DataSet.

The thing is that the column disappears the first time I open the window but (without closing the app) it will appear if I click on another tab and return to the one I’m having the problem.

I know the problem comes from the second relationship because when I comment this line it works perfectly:
DataSetGenerico.Relations.Add(relation2);

The first image shows what happens when opening the window for the first time, and the second image shows what happens when clicking on another tab and returning to the tab with the problem (without closing the app).First Time

Second Time

You can see on the first image that “Tipo de Local” is shown but with a very small width (is between “Dni Propietario” and “DNI propietario”), the second time is shown perfectly.

The AutoSizeColumnsMode is with DataGridViewAutoSizeColumnsMode.AllCells, I have tried all other DataGridViewAutoSizeColumnsMode possibilities with no luck. Also DataGridViewAutoSizeRowsMode.

Thank you.

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1 Answer

  1. Editorial Team

    After some trial and error I have found the solution.

    To solve this problem all that should be done is create all the wanted relations first, then add all the DataGridViewComboBoxColumn that you would need or want. If you create a relation after the creation of a DataGridViewComboBoxColumn you will face this problem even if the relation and the DataGridViewComboBoxColumn have nothing in common.

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