How do I make sure that a row is visible and a cell is in the editing state in Hierarchical mode?

[nasterhe]

I added a new row in TreeDataGrid, it is not visible when there are many rows, I want to make this row visible, and at the same time make a cell of this row enter the edit state, how can I do it? Thanks.

[maxkatz6]

What do you mean by "not visible"? Do you mean there is a bug in rendering, where row is not rendered at all? Or is it just out of view, and not materialized yet (not included in the visual tree yet)?

If that's a second, it's expected for non-visible rows to not be materialized yet.
But you can force scroll and materialization:

var treeModelIndex = CalculateRowTreeIndex();

// Get row absolute index.
var rowIndex = MyTreeDataGrid.Rows.ModelIndexToRowIndex(yourRowModel);

// Scroll into row, materializing it.
var materializedContainer = MyTreeDataGrid.RowsPresenter.BringIntoView(rowIndex);

// Focus to start editing
materializedContainer.Focus();

Where CalculateRowTreeIndex is the most difficult part, as you need to get IndexPath for your row.
So, for example, if you have a tree structure:

• Root
• • Child 1
• • Child 2

Then Child 2 will have tree index of new IndexPath(0, 1) (root is 0 index, then second child is 1 index, each additional nesting adds another index path number).
I am not aware of any API to get this index from existing data model. @grokys

[nasterhe]

Thanks.
RowsPresenter.BringIntoView can make sure that a row is visible in the TreeDataGrid, but the other question is how to make a cell in that row edit in code without the user having to double-click the mouse.