Imcompatibility between nb-select and nbTreeGrid

### Issue type

**I'm submitting a ...**

* [ X ] bug report
* [ ] feature request

### Issue description

**Current behavior:**
If you put an nb-select in an nbTreeGridCell the select close automatically immediately after opening and you can't pick any option

**Expected behavior:**
The list of options must stay opened

**Steps to reproduce:**
Create an nb-select in an nbTreeGridCell

**Related code:**
https://stackblitz.com/edit/github-b4n6ec

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