How can i Change the Size of the selected text in JTextPane using ConboBox

plzz help...
How can i Change the Size of the selected text in JTextPane using ConboBox ???
i m using if(cb.getSelectedItem=="small")
cb.setAction(new StyledEditorKit.FontSizeAction("double click", 12);)
if(cb.getSelectedItem=="medium")
cb.setAction(new StyledEditorKit.FontSizeAction("double click", 14);)
if(cb.getSelectedItem=="large")
cb.setAction(new StyledEditorKit.FontSizeAction("double click", 16);)
this code is not working properly according to the action i set on comboBox.
when i select medium the previously set action on comboBox works like small action work.
when i select large the medium action starts .
means its not working in correct time when i select item of combox n action of that item is not working at that time..
plzz plzz help me:(

Action action1 = new StyledEditorKit.FontSizeAction(
"double click", 12);
Action action2 = new StyledEditorKit.FontSizeAction(
"double click", 14);
Action action3 = new StyledEditorKit.FontSizeAction(
"double click", 18);
s2 = (String) cb7.getSelectedItem();
if (s2.equals("Small")) {
cb7.setAction(action1);
e1.setSource(cb7);
} else
if (s2.equals("Medium")) {
cb7.setAction(action2);
e1.setSource(cb7);
} else if (s2.equals("Large")) {
cb7.setAction(action3);
// e1.setSource(cb7);
when i chooze any combobox item then according to that item i set the Action on ComboBox but that action is not working properly on the selected text in the JTextPane..means selected text in JText Pane is not changes its Size according to the comboBox selected ITEM.
PLZ plzzzzzzzzzz help me:((.i will be thankfull to u.

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