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    1. COThank you for the reply. But I do not understand when you clear the grouping for a grid and then close the main window & then open the grid again, why the grouping feature is disabled? When I close the window, I am assume, the grid is also destroyed along with group feature. Now when I open the window (which load the grid) the grid should have the grouping feature enabled.
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    2. COFirst of all there is a difference between closing and destroying a window. Only the latter will make the relevant settings "forgotten". In your example, though, you're defining/creating a store. At no point is that store destroyed (you can't close a store - at least not in programming :-). In your grids you are *referencing* the store. And when you activate grouping, that command is passed on to the referenced store. Check out this: http://jsfiddle.net/W4UR5/ It's your code with windows not modal. Open both side by side and change grouping on either one > the other one will change too
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    3. COLook at it this way: The grid view only acts as a control interface for the store behind it. If click on a column header for sorting, the grid tells the store: "Sort by column X", then the store returns all the data in the sorted order and the grid updates its content. But a store can be used by many views at the same time. They will all be updated (filter, sort, group) when the store is changed - regardless of which view triggered the change.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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