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Editorial Team
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Asked: 2026-06-04T11:32:00+00:00

I have a problem with controls nested in a TabControl. I have a TabControl

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I have a problem with controls nested in a TabControl. I have a TabControl with n TabPages, with a DataGridView on each TabPage. Each DataGridView has a CheckBoxC column. I populate all datagridviews with different datasources (so each has different types of data). This is working ok!

I have added a ComboBox column so I can select all the rows on all DataGridViews. I do this programmatically (on a button click), and the counting of the selection is ok, except that the ticks are not added to checkBox cell of DataGridViews except on TabPage #1 (the one that I can see on startup).

If I click all the tabPages before I go and select all the rows in DataGridViews, the code works fine, and the ticks are added to all the rows (like I wanted).

But why this does not work without clicking all the tabPages? Is there any bug or something of TabControl?

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  1. Editorial Team

    I know this answer is correct for WPF, not positive about WinForms though. With WPF at least, it’s a visually based interface, so the program does not load any of the objects/controls/etc on other tabs until they are clicked on. So it wouldn’t be a bug, it’s a part of the design.

    I had a similar problem with trying to clear all textboxes on multiple tabs with a single button. I never did get it working, but I know there should be a way by using a combination of VisualTreeHelper and a foreach statement.

    Again, this is based off of WPF and not WinForms, but hopefully it can point you in the right direction as to how to solve it.

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