Chart drawing in ExtJS

We are looking for a programmer with good ExtJS / Sencha experience. Attached you'll find a mockup of the project, which has to be performed using ExtJS. ExtJS provides a decent built-in chart library: [login to view URL] So what we need is a ExtJS panel containing a chart showing different variables. In the mockup you can see charts 1 through 4 (dropdowns) set to different variables chosen by dropdown. Each chart's color is also chosen by dropdown through the user. The data behind it is just some sample arrays of X-Y number pairs (please create these), say 6 arrays consisting of 20 pairs each. So, in each dropdown, the user can choose to e. g. show array no. 5 on chart no. 2. When data changes (by some algorithm which is not important here) the chart shall be redrawn by klicking "redraw". Please consider the following: - The panel containing the chart shall be resizable. Accordingly, the chart area shall rescale on panel resize, too. - The user shall get some possibility to zoom in and out on X and Y. How? Well you know ExtJS better! Maybe some + - buttons, or maybe an intelligent slider? Do you have a proposition? Looking forward to questions! Timeline: next 2-3 days