Angular material Drag drop create group - css

I am using angular material drag drop and when it drop on any list or box it should create group like retrium
I have tried drag drop but i am not able to get how to create group when it's drop on other item

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google app maker - Fill text box based on drop down box selection

I am building a google app via the google app maker and have a drop down box with a list of values. What I want is a value to be displayed in a text box based on the value selected in the drop down.
So if you select "X" from the drop down "Y" appears in the textbox
If you select "A" in the drop down "B" appears in the textbox etc
I am very, very new to app maker - all my coding knowledge is in VBASIC.
There are different ways to achieve the desired result, but basically you need to start with setting both names and options for you dropdown:
Once you have that I would recommend to bind dropdown's value to something real, like datasource's filter (#datasources.Orders.query.filters.Type._equals) or to particular record's field (#datasource.item.SomeCoolField).
In case you are just learning App Maker and trying to do different things, you can bind both dropdown's and textbox's values to page's Custom Property.

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I am using a grid created in Apache Wicket. In the cells of one of the columns I have an icon. When that icon is clicked a pop up should be created showing data for that row. How should this be implemented so that the pop up is created and populated ONLY IF the user clicks on an icon? Can I link from the grid cell directly to java code where the pop up will be created?

Flex List Item's Accessory View

I am new to this Technology.
I want to display Accessory View(Right Side Arrow Button) in Flex List View.
How can I do this.?
I assume by accessory view you mean something like this; where you are displaying details on the selected item in the list.
First create a List with a custom itemRenderer. The itemRenderer should display the item's label and the arrow.
Second, create a component to display the detail from the selected item in the list. The implementation of this component will depend greatly on the data you want to display.
Third, listen to the change event of the List, and when the item changes, update the values being displayed in your "accessory" component.

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I have a problem in my project.I want to implement Tab bar function under a drop down selection and when once tab bar is clicked it has to be navigated to a data grid.Can any body suggest me the proper direction to implement it.
Thanks,
Brenda
Use a tab navigator, add canvases as children to that navigator, put your datagrid on one of those children.

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