haywire | asynchronous HTTP server framework written in C | HTTP library

I'm trying to implement the Tab function in my application, but it seems like nothing i try works, so i guess i just don't understand how it is intended to be used.

I have a User Control (lets call it MyControl) which contains a Text Box (as well as other stuff). The MyControl is used with a Tree View. It looks like this for the user (+ signs reveals the entire user control, aswell as child MyControl if there is any, Red Arrow shows expected Tab behavior):

In MyControl i've set IsTabStop to false for all control except TextBox, well i've pretty much set my entire application to have IsTabStop = false. I've tried setting KeyboardNavigation.TabNavigation to both "Cycle" and "Continue" on both MyControl and the TreeView, as well as the page and window that contains the TreeView. And i've tried in different combinations (cycle on treeview, continue on mycontrol and vice versa, etc).

I also tried setting TabIndex to the have the same order that the MyControl objects are created. (So the top one gets 1, second one gets 2, etc).

But nothing that i have tried (in all different combinations) has ever even made tab go into the TextBox that i want it to go into. So my problem is not only that the order is wrong, It just selects the "treeview", making a dotted square around it. If i change some settings the focus just goes haywire to random elements, but never the textbox

So, what am i doing wrong? How is Tab supposed to be implemented?

Don't know what code to show, but: MyControl:

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