child drop down list resizing

[vene]

Hi Everyone!
I need some help!
I created a web shop. When I creat a new child varinat product I met the following problem:
When I a want to choose from the diferent variations the dropdown list not showing all the possibilities (1.jpg).
Then next I choose the firts showing variations, appears on the basket button (it is ok), and the drop down list showing more two variations, but not the all. (2.jpg)
In this list I choose another variation what it have a child variation list to, but i can't see all the products.

How can I resizing the drop down list, I wan't a long list, where i can see all the variation.

thanks