Tooltip for Textedit not persistent and does not display the entire text

Hello Experts,

I have a Page fragment with the below tag.

           <htmlb:textEdit id="<%=l_id_note_display%>"

                            text="<%=l_note_change%><%=l_note_display%>"

                            width="100%" 

                            rows="<%=Z_CL_BSP_HAP_DOC_CS_30=>C_NOTE_ROWS%>"

                            wrapping="HARD"

                            disabled="<%=l_disabled %>"/>

I have added tooltip to this tag as given below.

                            tooltip="<%=l_note_change%><%=l_note_display%>"   

But the tooltip does not display the entire text in the text edit box. Also, the tooltip is visible for few seconds and then disappears. How do I overcome this issue?

Thanks,

Leena