In 1924, the thirteenth Dalai Lama prohibited the 9th Panchen Lama's followers from holding any office in the Central Tibetan government and imprisoned them in Lhasa, prompting the Panchen Lama to flee to Inner Mongolia, China.[31][32] The Dalai Lama was attempting to collect revenue from the Panchen Lama's estate to cover Tibet's military expenses, and to reduce the power of the Panchen Lama.[33] In China, the ninth Panchen Lama worked on plans to develop Tibet.[34] He also held a position in the Mongolian and Tibetan Affairs Commission, and was considered extremely "pro Chinese".[35][36][37] There, he adopted the ideas of Sun Yatsen through revolutionary Pandatsang Rapga of the Tibet Improvement Party.[38][39]