[Plugin: WP-dTree by Ulf Benjaminsson] Unable to go to parent category.

I’m not very familiar with the settings of this plugin.

So here goes, this is how the tree looks like(well roughly):
+ Category A
-Child category 1
-Child category 2
+ Category B
-Child Category 1
Category C
+ Category D
-Child category 1
-Child category 2

When I click on category A, Child cat 1 and 2 opens at the tree as shown above. I can click one child cat 1 and 2 and it links me to their sub-category contents respectively. I want to be able to click on the Category A and for it to open to its’ category content as well.

How am I to do that?

Please help and thanks in advance! ??