how to showing vertical scrollbar thumb when swt text contol size is increase?

[yatinbvn]

hi , my name is yatin

i have creating swt text with vertical scroll bar in shell, my question is:

vertical scroll bar thumb is still visible in swt text when its size is not increase , i want to showing that thumbs when size of swt text is increase ?

my code is below

import org.eclipse.ercp.swt.*;
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class{
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MobileShell chapternotesshell = new MobileShell(Display.getCurrent(), SWT.MAX);

chapternotesshell.setLayout(new FillLayout(SWT.VERTICAL));

Text chaptertextnotes = new Text(chapternotesshell,SWT.BORDER|SWT.MULTI|SWT.RE SIZE|SWT.V_SCROLL);

chaptertextnotes.setText("");
chaptertextnotes.setSelection(0);

chapternotesshell.layout(true);
chapternotesshell.open();
chapternotesshell.setActive();

}