Hi Irek,
The cell is non-editable by default. It's a result of the cell-style, "Figure", that's being applied. The fact that the cell non-editable sounds like a bug. I'll report it. For reference, a non-editable will display an "x" near the top of the cell-bracket (see the attachment: Non-EditableCellBracket.png).
But you can make the cell editable. And it can be accomplished in a variety of ways. Here a couple of distinct approaches that override the setting without actually changing the cell-style:
(Method 1) Modify the cell:
This method localizes the change to the selected cell(s).
1. Select one or more targeted cells
2. Choose Cell > Cell Properties > Editable from the main menus
(Method 2) Modify the style definition:
This method changes the option setting to Editable->True for all "Figure" cells by embedding a custom stylesheet.
1. Choose Format > Edit Stylesheet...
2. From the "Customize Inherited Style" drop-down select: Figure. A "Figure"-style cell will be inserted (see EmbeddedStyle_Step2.png, attached)
3. Select the style-cell's cell-bracket, and choose Cell > Cell Properties > Editable from the main menus (see EmbeddedStyle_Step3.png, attached)
Although it's a little more work than Method 1, Method 2 is more beneficial. It only requires a single change that applies to all "Figure" cells. Method 1, however, requires change made to each "Figure" cell.
Let me know if you have any questions or concerns.
Attachments:
