Adobe Flex: Error#1034 in trying to validate datagrid input - apache-flex

Question

Trying to validate the input in my data grid, I am using a function (taken from an Adobe example).
This is how the grid goes:
<mx:DataGrid id="CashGrid" dataProvider="{cash}" editable="true" itemEditBeginning="allowForEdit(event)" itemEditEnd="formatData(event);" sortableColumns="false">
<mx:columns>
<mx:DataGridColumn textAlign="left" dataField="curName" headerText="Currency" />
<mx:DataGridColumn textAlign="right" dataField="value" headerText="Value" width="150">
</mx:columns>
</mx:DataGrid>
And here is the function from the AS part
public function formatData(event:DataGridEvent):void
{
if (event.reason == DataGridEventReason.CANCELLED)
{
// Do not update cell.
return;
}
var newData:String= TextInput(event.currentTarget.itemEditorInstance).text;
// Determine if the new value is an empty String.
if(newData == "")
{
event.preventDefault();
TextInput(cashGrid.itemEditorInstance).errorString=
"Enter a valid string.";
return;
}
}
Although it works in the source example, in my example, on editing said grid, an error pops up saying
TypeError: Error #1034: Type Coercion failed: cannot convert mx.controls::TextInput#f093c29 to spark.components.TextInput.
Trying to
import mx.controls.TextInput;
tells me
Can not resolve a multiname reference unambiguously. spark.components.TextInput.
I guess there is some confusion with the namespaces, but I have no idea how to make this work.
Help!
Thanks

Answer 1

I cannot reproduce the error with the given code. It's working fine on my end. Please send me the code for allowForEdit(event) as well.
Which SDK version are you using?
What is the root application namespace? Please paste the entire application namespace.