Steps to reproduce:
Navigate to example with iPad, or chrome with iPad emulation.

With default settings:
touch + drag to scroll does not work, and the scrollbar displayed breaks or is replaced.

debug info

• With the following in zk.xml :
  <library-property>
  <name>org.zkoss.zul.nativebar</name>
  <value>true</value>
  </library-property>
  The touch+drag works but the scrollbar is not displayed
• Listbox also has this issue