I have built some visualization tables and charts on a page and I have found an issue that I can't resolve.
I have separated tables & charts into categories using jQuery Tabs()
On one tab (Tab 4) I have a Pie Chart and a Line Chart
When the page loads and draws all the tables/charts and Tab 4 is NOT in focus (default) - the Line Chart does not draw the Legend OR Chart Labels. (the Pie Chart Loads fine)

When Tab 4 is in focus on page load - the Line Chart draws the Legend and Labels as expected.
How? Why?
Why would labels and legend not load if the Line Chart is within a div not initially visible?
Why do they load fine on the Pie Chart in the same situation?