IllegalArgumentException : width is negative when using Form Heading
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                 Key: PIVOT-582
                 URL: https://issues.apache.org/jira/browse/PIVOT-582
             Project: Pivot
          Issue Type: Bug
          Components: wtk-terra
    Affects Versions: 1.5
         Environment: mac os x 10.6, java 6
            Reporter: A.J.


Receiving an exception "java.lang.IllegalArgumentException: width is negative." 
message when trying to add a heading in a Form container embedded within a 
Border > TabPane > SplitPane container hierarchy.

Bug can be reproduced with the following wtkx :

<Window title="Form Bug" maximized="true"
                xmlns:wtkx="http://pivot.apache.org/wtkx";
                xmlns="org.apache.pivot.wtk">
        <content>
                        <SplitPane orientation="horizontal" splitRatio="0.3">
                                <left>
                                        <TabPane>
                                                <tabs>
                                                        <Border 
TabPane.label="Left Part">
                                                                <content>
                                                                        <Label 
text="Left content" />
                                                                </content>
                                                        </Border>
                                                </tabs>
                                        </TabPane>
                                </left>
                                <right>
                                        <TabPane>
                                                <tabs>
                                                        <Border 
TabPane.label="Right Part">
                                                                <content>
                                                                        
                                                                        <Form 
styles="{showFirstSectionHeading:true}">
                                                <sections>
                                                    <Form.Section heading="Some 
heading">
                                                        <BoxPane 
Form.label="Some item">
                                                            <TextInput 
text="Some text"/>
                                                        </BoxPane>
                                                    </Form.Section>
                                                </sections>
                                            </Form>
                                            
                                                                </content>
                                                        </Border>
                                                </tabs>
                                        </TabPane>
                                </right>
                        </SplitPane>
        </content>
</Window>

removing the heading or turning it off with the "showFirstSectionHeading" style 
fixes the problem but this means headings cannot be used in the form.


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