Sencha GXT grid - gap in column header menu and 2nd column header - gxt

I am using Sencha GXT 4.0.2. I have added Grid inside a BorderLayoutContainer. When the UI is rendered, there is a small gap between the column header context menu arrow and next column header. For eg. width of <tr> is set to 100px, but width of <div> in header is 87px.
Following is the flow of control:
view -> BorderLayoutContainer -> BorderLayoutContainer -> FlowLayoutContainer ( as center layout data) -> Grid ( as widget )
When I add the editor to this grid, and start editing, all the columns of the selected row and its editors are shifted to left (as if they are inline with the <div> element's width).
The problem I am facing is similar to what is posted in gxt (ext gwt) Grid and column width for gwt ext, but my issue is with Sencha gxt.
Any help is much appreciated.
header misalignment
editor-misalignment

This particular problem occurs when the grid is not provided with a size from either the parent container or directly with grid.setPixelSize(int, int). You can test this out by setting grid.setPixelSize(500,500) and the columns and rows should be sized properly. If that doesn't work, a test case with the problem would be needed to replicate the issue.

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How can I make the row height of a grid taller?
You should try creating a custom CSS class for the row element. You can add some runtime code to the .cs code file for the page. See this article

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I thought this was due to my own custom formatter, but it also happens for the textarea and html formatters.
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The react-virtualized Grid component accounts for horizontal and vertical scrollbar size to avoid this problem. (You can see this on the Grid demo page.) However it's expected that the List component will not scroll horizontally so it will only account for the vertical scrollbar size.
If your UI needs to scroll horizontally, you may have better luck using a 1-column Grid.

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sorry for my question, but I'm android beginner :-)
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linear layout - horizontal with 3 rows of labels
only first label is visible if expander is collapsed
top of screen
body
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scrollable vertical
horizontal will change body with another (not necessary now)
in body will be two level list - headers as parent, expandable to child
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linear layout - vertical (with 4 images icons)
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