[FLEX-22108] RTE hiding DataGrid headers and excluding a DataGridColumn with a state change.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Adobe Flex SDK Previous
• Component/s: mx: DataGrid, States
• Environment: Affected OS(s): All OS Platforms; Affected OS(s): All OS Platforms; Browser: Firefox 3.x; Language Found: English
• Assignee: Adobe JIRA
• Reporter: Adobe JIRA
• Created: 19/Nov/09 12:31
• Updated: 15/Apr/11 15:13
• Resolved: 03/Dec/09 23:07

Description

Steps to reproduce:
1. Create a DataGrid with two states(States A and B) and at least two columns(Columns X and Y). The width of the data grid in State A must be small enough that the column header would be forced to wrap. State B must have the headers shown and State A must have them hidden. Column A must exist in all states and column B must be excluded from State A.

In the example, Product is state A and Supplier is state B. DataGridColumn Supplier is Column A, and DataGridColumn Model Number is Column B.

---

<mx:DataGrid left="0" top="0" width="100%" height="100%" id="pickerListDG" editable="false" dataProvider="{_workingSet}" showHeaders.Product="true" showHeaders.Supplier="false">
<mx:columns>
<mx:DataGridColumn headerText="Supplier" dataField="supplier"/>
<mx:DataGridColumn headerText="Model Number" dataField="modelNumber" excludeFrom="Supplier"/>
</mx:columns>
</mx:DataGrid>

---

2. Attempt to run the sample code and note the crash. "Cannot access a property or method of a null object reference." from DataGridBase.columnHeaderWordWrap

Actual Results:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at mx.controls.dataGridClasses::DataGridBase/http://www.adobe.com/2006/flex/mx/internal::columnHeaderWordWrap()
at mx.controls.dataGridClasses::DataGridItemRenderer/validateProperties()
at mx.managers::LayoutManager/validateClient()
at mx.controls.dataGridClasses::DataGridHeader/updateDisplayList()
at mx.core::UIComponent/validateDisplayList()
at mx.managers::LayoutManager/validateDisplayList()
at mx.managers::LayoutManager/doPhasedInstantiation()
at mx.managers::LayoutManager/doPhasedInstantiationCallback()

Expected Results: Column Supplier should appear without a header in the Supplier state, and Columns Supplier and Model Number should appear with headers in the Product state.

Workaround (if any): Allowing all columns to exist in all states, showing headers in all states, or hiding headers in all states.