when i am clicking the +/- symbol of the tree in the treetable, the treeexpansionevent is not being fired. But when i'm clicking a slighly above the +/- symbol its getting fired sometimes. The problem occuring only with nodes whose children are leaf nodes.what should be done?

Again the expansion/collapsing is working for nodes having even no.of children only. If the node is having odd no.of children, the exoansion/collapsion is not working.

Pls help